CBS 11 News has learned that the FBI and U.S. Postal Inspectors are investigating six letters containing white powder that arrived at a variety of North Texas locations Thursday, including Dallas Love Field Airport and two churches.

At 5 p.m. the number of suspicious letters went rom five to six when it was discovered another envelope had arrived at a mosque in Richardson.

The letters began arriving Thursday morning. Federal officials are trying to determine who sent the letters and hazardous materials crews are testing the powder in the field to determine what it is.

All of the incidents involved white powder delivered in regular business-sized envelopes.

The first case was reported around 11 o'clock at St. Joseph's Catholic Church in Richardson. Fire Department investigators tested the powder while at the location and it came back negative for anything of concern.

Richardson fire officials say there was also another incident in their city. That incident involved white powder delivered to the First Baptist Church.

Around the same time as the St. Joseph's incident, a letter came into the mail room at Microsoft's offices located in the 7000 block of State Highway 121 in Irving. The powder there was also tested and while the results were not released to CBS 11 News workers at the location have resumed their duties and both fire and police left the scene.

By the Noon hour another 'white powder' call sent to Spenro in the 1500 block of West North Carrier Parkway in Grand Prairie, a company that makes tools for Bell Helicopter.

Just after 2:00 p.m. Dallas PD and Dallas Fire Rescue were at Dallas Love Field Airport. White powder was found there in Hanger E. Gulfstream's name appeared on the outside of the envelope. Hazardous materials teams were called to the location and were testing to see what the substance might be.

Investigators are trying to determine if the same person sent all of the letters.

http://cbs11tv.com/local/white.powder.suspicious.2.1845132.html

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